package main
import (
	"fmt"
)
func main() {
	var x1, x3, day = 0, 1, 9
	for day > 0 {
		x1 = (x3 + 1) * 2
		x3 = x1
		day--
	}
	fmt.Printf("一共有桃子： %d\n", x1)
}